Steam-boiler furnace.



Patented Aug. 31, 1909.

WITNESS 5 @Qi Danie Z L DANIEL L. BROWNFIELD, OF FARMER, WASHINGTON.

STEAM-BOILER FURNACE Application filed July 17, 1908.

Specification of Letters Patent.

Patented Aug. 31 1909.

Serial No. 444,007.

To all whom it "may concern:

Be it known that I, Dxxnn. L. lhawvxrinLo, citizen of the United States,residing at Farn'ier, in the county of Douglas and State of IVashington,have invented certain new and useful Improvements in Steam- Boile'rFurnaces, of which the following is a specification.

This invention relates to steam-boiler furnaces and more particularlyone designed for burning straw.

The object of the present invention is to provide a furnace structurewhich will prevent the fire-box from filling with ashes, and also toprevent accumulation, such as ashes beneath the grate, and also to keepwater on the crown sheet both down and up hill, thereby preventing thecrown sheet from being burned while traveling on rolling land.

In the accompanying drawings, Figure l is a vertical sectional view ofthe boiler and furnace. Fig. 2 is a plan view. Fig. 3 is a plan view ofthe traveling grate.

Referring specifically to the drawing, 5 denotes an upright boilercomprising a vertical cylindrical shell (3 in the lower end of which isplaced the fire-box 7. The space between the two is filled with water,as shown in Fig. 1. The fire-tubes 8 extend from the top sheet 9 of thefire-box, as usual. The fire-box extends outwardly from the front of theboiler for a short. distance, as indicated at 10, and at the said end ofthe boiler it also extends a short distance above the top sheet 9, asindicated at 11. Beneath the top sheet 9 is located an inclined arch 12of fire brick or other suitable material. The arch extends across thefire box from one side to the other. Its front end extends into thespace 11 of the firc box and its rear end extends to the rear wall ofthe fire box. At the front end of the arch is an upstanding portion 13spaced from the shell of the boiler and having its top located a shortdistance above the top sheet 9. The arch serves as a baffle plate todirect the flames upwardly with the portion 11 of the fire box and thenover the wall 13 and then back of the arch to the fire tubes, as shownby arrows in Fig. 1. The advantage of this construction is that thefiames and unburned straw are caused to travel around in the recess 11,over the upper edge of the part 13, and the straw is checked by strikinga lower end of the boiler, giving it time to burn more completely beforereaching the fiues, and

thereby preventing clogging the tines with unburned straw, which a wellknown dcfect in straw burners. l urthcrmore, the the heats the water inthe hollow walls of the fire box, particularly at the top part thereof,where it projects above the end 13 of the ball'le plate, which causes anin'iproved circulation in the boiler, and the lower end of the boilerprojects into the fire box, so to speak, whereby the flames strike theouter shell of the boiler, giving an increased heating surface. If thetop sheet of the boiler were straight across, the burning straw woulddraw directly into the fines, choking them at once.

Through the front wall of the fire box 7 passes a straw chute14lprovided with an upwardly and inwardly swinging door 15. The chuteenters the fire box near the front end of the arch 12 and at thedischarge end of the chute is mounted an inclined deflector plate 16 toprevent the straw fuel from being carried along with the draft.

In the fire box, below the discharge end of the chute 14, is located adead-plate 17 to hold the fresh fuel. Below the dead-plate is arranged atraveling or chain grate comprising grate bars 18 carried by endlesschains 19 which travel over sprocket wheels 20. The grate may beoperated by any suitable mechanism. I have shown a sprocket wheel 21 onthe shaft of one of the sprocket wheels 20 which may be connected by achain to any suitable running part of the engine and geared so as togive the proper speed. Any other suitable driving gear may be employed.

In the front wall of the fire box, below the chute 1a is an opening 22which leads to an ash-box 23 provided with a door 2% in its bottom. Thechain-grate passes through the opening 22 into the box 23. The grate isinclined, its front end being near the top of the ash-box and its rearend being near the rear wall of the fire-box and close to the floor ofthe latter and beyond the end of the deadplate 17.

The object of the chain grate is to prevent the fire box from fillingwith ashes, or, in other words, to maintain a clean fire, and also tokeep the ashes from beneath the grate and to draw them into the box 23from which they may be readily dumped upon openmg the door.

In the rear wall of the fire box, near the bottom thereof is a draftopening 25 fitted with a damper 26. In front of this draft opening arediagonal stationary grate bars 27. The rear wall of the fire box, abovethe arch 12, is also provided with a cleaning door 28.

By the structure herein described a practical and highly efficientstraw-burning furnace is had, and the accumulation of ashes, which is asource of much trouble in this type of furnaces, is effectuallyprevented.

The parts are simple and few and are readily accessible by reason ofwhich the furnace can be easily kept in good working order.

I claim:

1. The combination with an upright firetube boiler and a fire boxthereunder, the tubes of the boiler opening through the top of thefire-box and the front part of the latter projecting forwardly beyondthe boiler, of a baffle plate extending forwardly across the fire boxfrom its rear wall and under the entrance for the fire tubes andprojecting at its front end above the entrance of the said tubes.

2. The combination with an upright fire tube boiler, of a fire boxthereunder having an extension in front of the boiler shell and abovethe top sheet, a baffle plate extending across the fire box below thetop sheet and the tube inlets and projecting forwardly and upwardly fromthe rear wall of the fire box and into the extension, and a grate belowthe ba'l'l'le plate.

In testimony whereof I aHiX my signature in presence of two witnesses.

DANIEL L. BROVNFIELD.

lVitnesses L. A. WVEsToN,

lonniz'r l/VIIITTIER.

